A rope coring tool in-position alarm and longitudinal locking device

Abstract

The present invention belongs to the technical field of offshore oil production and discloses a device for using a more reliable rope coring tool in position alarm and longitudinal locking, comprising a bottom drill assembly longitudinal locking mechanism; an in-position alarm mechanism that is stuck in its central flow channel, comprising an alarm joint and a starting sleeve that is sleeved in the alarm joint and connected via a positioning mechanism, a locking joint that is connected to the alarm joint and communicates with the starting sleeve; a pulling mechanism that axially passes through the in-position alarm mechanism; an external locking mechanism for locking the alarm joint on the central flow channel; and an internal locking mechanism for locking the pulling mechanism on the locking joint. The device is constructed such that in the initial state, the external locking mechanism is unlocked, and the internal locking mechanism and the positioning mechanism are locked; in the working state, fluid passes through the locking joint and pushes the starting sleeve downward to unlock the positioning mechanism. The starting sleeve slides down relative to the alarm joint to the external locking mechanism and locks to the central flow channel to realize the in-position alarm, while the internal locking mechanism is unlocked to realize the lifting of the pulling mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of offshore oil production, and in particular to a rope coring tool in-place alarm and longitudinal locking device. Background Art

[0002] In the field of offshore oil extraction technology, rope coring tools are currently commonly used for deepwater shallow sampling. However, due to the water depth, it is very difficult to determine whether the coring tool is in place. The coring tool in place alarm mechanism is mainly used to determine whether the coring tool is in place, that is, to determine whether the coring tool has reached the ring seat of the bottom drill assembly. When the coring tool is in place, the channel for mud to enter the tool is blocked, forcing the mud to open the water outlet channel. During this process, the pump pressure will increase, giving a pump pressure signal to the ground, so that the operator knows that the tool is in place. When the coring tool is in place, it will be locked in the bottom drill assembly through the coring tool longitudinal locking mechanism. When the pump pressure continues to rise to a certain value, the coring tool longitudinal locking mechanism will be unlocked to enable the coring tool's coring tube to be lifted, thereby realizing the linkage of the lower mechanism connected to the coring tube.

[0003] However, existing coring tools have problems such as complex structure, poor stability, low pump pressure that can be tolerated during the coring process, unclear pump pressure signal fed back to the ground, and easy wear of parts resulting in failure of the in-place alarm. Summary of the Invention

[0004] In order to improve the reliability of the in-position alarm and locking of a rope coring tool during use, the present invention proposes an in-position alarm and longitudinal locking device for a rope coring tool.

[0005] The in-place alarm and longitudinal locking device of the rope coring tool according to the present invention comprises: a bottom drill assembly longitudinal locking mechanism having a central flow channel, an in-place alarm mechanism capable of being stuck in the central flow channel, the in-place alarm mechanism comprising an alarm joint for being stuck in the central flow channel and a starting sleeve sleeved in the alarm joint, the alarm joint and the starting sleeve being connected through a positioning mechanism, and a locking joint fixedly connected to the top of the alarm joint and axially connected to the starting sleeve, a pulling mechanism axially passing through the locking joint and the starting sleeve, the pulling mechanism being sealingly connected to the starting sleeve, and an outer locking mechanism for locking the alarm joint on the central flow channel Mechanism, and an internal locking mechanism for locking the pulling mechanism on the locking joint, wherein the rope coring tool in-place alarm and longitudinal locking device are constructed to have an initial state and a working state. In the initial state, the alarm joint is stuck in the central flow channel, the external locking mechanism is unlocked, the internal locking mechanism is locked, and the positioning mechanism is locked; in the working state, the fluid passes through the locking joint and pushes the starting sleeve downward, so that the positioning mechanism is unlocked, and the starting sleeve slides down relative to the alarm joint until the external locking mechanism is locked on the central flow channel to realize the in-place alarm, and at the same time the internal locking mechanism is unlocked to realize the lifting of the pulling mechanism relative to the starting sleeve.

[0006] Furthermore, the longitudinal locking mechanism of the bottom drill assembly includes a drill string joint and an outer tube coaxially connected to each other, and a seat ring. An inner ring groove is formed between the drill string joint and the outer tube, and the seat ring seal is embedded in the inner ring groove. The inner diameter of the seat ring on the side close to the drill string joint is smaller than the inner diameter of the drill string joint. A limiting step is formed on the outer peripheral wall of the alarm joint for abutting against the side of the seat ring close to the drill string joint.

[0007] Furthermore, an outer locking groove is formed on the outer peripheral wall of the starting sleeve, and a snap-fit ​​groove is formed on the inner peripheral wall of the seat ring on the side away from the drill string joint. The external locking mechanism includes a through groove formed on the alarm joint and an outer locking block connected to the through groove through a first shaft. A first axial through hole for passing the first shaft is formed in the outer locking block. The aperture of the first axial through hole is larger than the diameter of the first shaft, so that in the initial state, the outer locking block is located in the outer locking groove but not in the snap-fit ​​groove. In the working state, the outer locking block escapes from the outer locking groove and enters the snap-fit ​​groove.

[0008] Furthermore, the positioning mechanism includes a positioning groove formed on the outer peripheral wall of the starting sleeve, a receiving groove formed on the inner peripheral wall of the alarm connector, a disc spring located in the receiving groove, and a positioning ball located between the disc spring and the positioning groove. In the initial state, the positioning ball is elastically supported in the positioning groove by the disc spring. In the working state, the disc spring is compressed to allow the positioning ball to escape from the positioning groove.

[0009] Furthermore, a connecting section for connecting the top of the alarm connector and a first step for abutting the top of the starting sleeve are formed on the outer peripheral wall of the locking connector. The first step is formed at one end of the connecting section close to the starting sleeve, and a second step is formed on the inner peripheral wall of the alarm connector. The starting sleeve includes an axially connected large diameter section and a small diameter section. The top of the large diameter section abuts the first step, and a travel spacing is formed between the bottom end of the large diameter section and the second step. The positioning groove and the outer locking groove are formed in sequence on the small diameter section.

[0010] Furthermore, the internal locking mechanism includes an internal locking groove formed on the outer peripheral wall of the lifting mechanism, an internal locking block connected to the locking joint through a second shaft, a second axial through hole for passing the second shaft is formed in the internal locking block, and the aperture of the second axial through hole is larger than the diameter of the second shaft. In the initial state, the internal locking block is located between the inner peripheral wall of the large diameter section and the internal locking groove. In the working state, the internal locking block is out of the internal locking groove and is located between the alarm joint and the lifting mechanism.

[0011] Furthermore, in the initial state, a recovery hole is formed at a position of the alarm connector opposite to the inner locking groove.

[0012] Furthermore, an axial channel is formed on the locking joint, and the axial channel includes a central channel for passing through the pulling mechanism and a fluid channel connected to the central channel. The fluid acts in the large diameter section through the fluid channel to push the starting sleeve downward.

[0013] Furthermore, the lifting mechanism includes an inner locking rod and an inner pulling rod coaxially connected, the inner pulling rod is used to be connected to the coring tube of the coring tool, and in the initial state, the connection area between the inner locking rod and the inner pulling rod is sealed with the small diameter section of the starting sleeve.

[0014] Furthermore, a first sealing ring located between the positioning mechanism and the external locking mechanism and a second sealing ring located at the bottom end of the starting sleeve are provided between the starting sleeve and the alarm connector, and the external locking mechanism is located between the first sealing ring and the second sealing ring.

[0015] Compared to existing technologies, the structure and operation of the rope coring tool's in-place alarm and longitudinal locking device of the present invention are simpler and more reliable. It provides an in-place alarm function with adjustable in-place alarm pressure, while also enabling longitudinal locking and the lifting function of the lifting mechanism. This makes the in-place alarm and locking functions more stable during use and less prone to failure. Furthermore, the in-place alarm and longitudinal locking device of the rope coring tool of the present invention is simpler and more reliable when resuming operation after completion of work, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 2 is a schematic structural diagram of a rope coring tool in-position alarm and longitudinal locking device in an initial state according to an embodiment of the present invention;

[0017] Figure 2 2 is a schematic structural diagram of a rope coring tool in-position alarm and longitudinal locking device in a working state according to an embodiment of the present invention;

[0018] Figure 3 for Figure 1 Side view of the locking connector shown. DETAILED DESCRIPTION

[0019] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0020] Figure 1 and Figure 2 The structure of a wireline coring tool in-position alarm and longitudinal locking device 100 according to an embodiment of the present invention is shown. The wireline coring tool in-position alarm and longitudinal locking device 100 comprises: a bottom drill assembly longitudinal locking mechanism 1 having a central flow channel, an in-position alarm mechanism 2 capable of being stuck in the central flow channel, the in-position alarm mechanism 2 comprising an alarm joint 21 for being stuck in the central flow channel and a start sleeve 22 sleeved in the alarm joint 21, the alarm joint 21 and the start sleeve 22 being connected via a positioning mechanism 4, a locking joint 23 fixedly connected to the top of the alarm joint 21 and axially connected to the start sleeve 22, a pulling mechanism 6 axially passing through the locking joint 23 and the start sleeve 22, the pulling mechanism 6 being sealed with the start sleeve 22 and used to lock the alarm joint 21 on the central flow channel. Mechanism 3, and an internal locking mechanism 5 for locking the pulling mechanism 6 on the locking joint 23, wherein the rope coring tool in-place alarm and longitudinal locking device 100 is constructed to have an initial state and a working state. In the initial state, the alarm joint 21 is stuck in the central flow channel, the external locking mechanism 3 is unlocked, the internal locking mechanism 5 is locked, and the positioning mechanism 4 is locked; in the working state, the fluid passes through the locking joint 23 and pushes the starting sleeve 33 downward, so that the positioning mechanism 4 is unlocked, and the starting sleeve 22 slides down relative to the alarm joint 21 until the external locking mechanism 3 is locked on the central flow channel to realize the in-place alarm, and at the same time the internal locking mechanism 5 is unlocked to realize the lifting of the pulling mechanism 6 relative to the starting sleeve 22.

[0021] Through the above arrangement, in the initial state, the in-place alarm mechanism 2 is stuck in the longitudinal locking mechanism 1 of the bottom drill assembly, the pulling mechanism 6 is fixed to the in-place alarm mechanism 2, and the alarm joint 21 is fixed to the starting sleeve 22, so that the in-place alarm mechanism 2 and the pulling mechanism 6 are lowered into the longitudinal locking mechanism 1 of the bottom drill assembly together to prepare for the subsequent in-place alarm; in the working state, the fluid passes through the locking joint 23 and pushes the starting sleeve 33 downward, so that the positioning mechanism 4 is unlocked. At this time, the starting sleeve 22 can slide down relative to the alarm joint 21 until the alarm joint 21 and the longitudinal locking mechanism 1 of the bottom drill assembly are locked by the external locking mechanism 3, realizing the in-place alarm, and at the same time the internal locking mechanism 5 is unlocked, so that the pulling mechanism 6 and the locking joint 23 are unlocked, so that the pulling mechanism 6 can be lifted relative to the starting sleeve 22.

[0022] According to the present invention, Figure 1 and Figure 2 In the preferred embodiment shown, the bottom hole assembly longitudinal locking mechanism 1 may include a drill string joint 11 and an outer cylinder 12 coaxially connected, and a seat ring 13. An inner ring groove 121 is formed between the drill string joint 11 and the outer cylinder 12. The seat ring 13 is sealed and embedded in the inner ring groove 121. The inner diameter of the side of the seat ring 13 close to the drill string joint 11 is smaller than the inner diameter of the drill string joint 11. A limiting step 213 (such as 213) for abutting against the side of the seat ring 13 close to the drill string joint 11 is formed on the outer peripheral wall of the alarm joint 21. Figure 2 In this embodiment, the drill string joint 11 and the outer cylinder 12 can be threadedly connected, and a third sealing ring 91 can be provided between the seat ring 13 and the outer cylinder 12. By setting the inner diameter of the side of the seat ring 13 close to the drill string joint 11 to be smaller than the inner diameter of the drill string joint 11, and forming a limiting step 213 on the outer peripheral wall of the alarm joint 21 for abutting against the side of the seat ring 13 close to the drill string joint 11, the alarm joint 21 can be abutted against the contact point between the ring seat 13 and the limiting step 213.

[0023] Furthermore, if Figure 1 and Figure 2As shown, an outer locking groove 25 is formed on the outer peripheral wall of the starting sleeve 22, and a snap-fit ​​groove 131 is formed on the inner peripheral wall of the seat ring 13 on the side away from the drill string joint 11. The outer locking mechanism 3 may include a through groove 34 formed on the alarm joint 21 and an outer locking block 32 connected to the through groove 34 through the first shaft 31. A first axial through hole 33 for passing the first shaft 31 is formed in the outer locking block 32. The aperture of the first axial through hole 33 is larger than the diameter of the first shaft 31, so that in the initial state, the outer locking block 32 is located in the outer locking groove 25 but not in the snap-fit ​​groove 131, and in the working state, the outer locking block 32 escapes from the outer locking groove 25 and enters the snap-fit ​​groove 131. By making the aperture of the first axial through hole 33 larger than the diameter of the first shaft 31, the outer locking block 32 can be adjusted relative to the first shaft 31 in the longitudinal direction (i.e., Figure 1 The outer locking block 32 is moved up and down in the vertical direction (as shown in the figure), so that in the initial state, the outer locking block 32 is located in the outer locking groove 25 but not in the engaging groove 131, so that the starting sleeve 22 and the bottom hole assembly longitudinal locking mechanism 1 are not locked. In the working state, the outer locking block 32 is released from the outer locking groove 25 and enters the engaging groove 131, so that the starting sleeve 22 and the bottom hole assembly longitudinal locking mechanism 1 are locked.

[0024] Preferably, the outer locking grooves 25 can be multiple, more preferably three, formed circumferentially spaced apart on the outer peripheral wall of the starting sleeve 22. The outer locking grooves 25 are preferably through holes, the shape of which can be adapted to the shape of the outer locking block 32.

[0025] According to the present invention, combined Figure 1 and Figure 2 As shown, the positioning mechanism 4 may include a positioning groove 24 formed on the outer circumferential wall of the starting sleeve 22, a receiving groove 28 formed on the inner circumferential wall of the alarm connector 21, a disc spring 41 positioned within the receiving groove 28, and a positioning ball 42 positioned between the disc spring 41 and the positioning groove 24. In the initial state, the positioning ball 42 is elastically supported within the positioning groove 24 by the disc spring 41. In the operating state, the disc spring 41 is compressed to allow the positioning ball 42 to disengage from the positioning groove 24. In the initial state, the positioning mechanism 4 locks the starting sleeve 22 and the alarm connector 21 in the aforementioned manner. In the operating state, the starting sleeve 22, pushed by the fluid, overcomes the elastic force of the disc spring 41, allowing the positioning ball 42 to disengage from the positioning groove 24. In this embodiment, the alarm pressure can be adjusted by varying the elastic force and number of the disc springs 41, the number of positioning grooves 24, and the number of positioning balls 42, thereby enabling the rope coring tool in-place alarm and longitudinal locking device 100 to achieve adjustable alarm pressure.

[0026] Preferably, the accommodating grooves 28 on the inner wall of the alarm connector 21 can be multiple, preferably six, circumferentially spaced. The accommodating grooves 28 can preferably include a threaded hole and a positioning ball sleeve installed in the threaded hole. The disc spring 41 is installed in the positioning ball sleeve so that it can provide more stable longitudinal support for the positioning ball 42.

[0027] Furthermore, in Figure 1 In the preferred embodiment shown, the outer peripheral wall of the locking connector 23 is formed with a top end (i.e. Figure 1 The alarm connector 21 includes a connecting section 231 (shown at the left end) and a first step 232 for abutting the top of the start sleeve 22. The first step 232 is formed at the end of the connecting section 231 near the start sleeve 22. A second step 27 is formed on the inner circumferential wall of the alarm connector 21. The start sleeve 22 includes an axially connected large-diameter section 211 and a small-diameter section 121. The top of the large-diameter section 211 abuts the first step 232. A travel spacing H is formed between the bottom end of the large-diameter section 211 and the second step 27. The positioning groove 24 and the outer locking groove 25 are sequentially formed on the small-diameter section 121 at intervals. In this embodiment, the top of the alarm connector 21 is threadedly connected to the connecting section 231 of the locking connector 23, and the spacing H is set to limit the axial sliding travel of the start sleeve 22 relative to the alarm connector 21.

[0028] Furthermore, if Figure 1 As shown, the internal locking mechanism 5 may include an internal locking groove 63 formed on the outer peripheral wall of the lifting mechanism 6, an internal locking block 52 connected to the locking joint 23 through the second shaft 51, and a second axial through hole 53 for passing the second shaft 51 is formed in the internal locking block 52. The aperture of the second axial through hole 53 is larger than the diameter of the second shaft 51. In the initial state, the internal locking block 52 is located between the inner peripheral wall of the large diameter section 211 and the internal locking groove 63. In the working state, when it is necessary to lift the lifting mechanism 6, the internal locking block 52 disengages from the internal locking groove 63 and is located between the alarm joint 21 and the lifting mechanism 6. By setting the diameter of the second axial through hole 53 to be larger than the diameter of the second shaft 51, the inner locking block 52 can be moved up and down in the longitudinal direction relative to the second shaft 51, so that in the initial state, the inner locking block 52 is located between the inner circumferential wall of the large diameter section 211 and the inner locking groove 63, so as to realize the locking of the lifting mechanism 6 and the locking joint 23, that is, the locking of the lifting mechanism 6 and the in-place alarm mechanism 2; and in the working state, the starting sleeve 22 descends under the pressure of the fluid, so that the large diameter section 211 is disengaged from between the inner locking block 52 and the alarm joint 21. When the lifting mechanism 6 needs to be lifted, the inner locking block 52 is disengaged from the inner locking groove 63 and is located between the alarm joint 21 and the lifting mechanism 6, which will not affect the lifting of the lifting mechanism 6.

[0029] Preferably, the inner locking grooves 63 can be multiple, more preferably three, formed circumferentially spaced apart on the outer peripheral wall of the pulling mechanism 6. The inner locking grooves 63 are preferably through holes, the shape of which is adapted to the shape of the inner locking block 52.

[0030] According to the present invention, Figure 1 As shown, in the initial state, a recovery hole 26 is formed on the alarm connector 21 at a position opposite to the inner locking groove 63. The recovery hole 26 is provided for use when the lifting mechanism 6 needs to be restored to the initial state after being lifted. The use of the recovery hole 26 will be described in detail below.

[0031] Combine Figure 1 and Figure 3 As shown, an axial channel is also formed on the locking joint 23, and the axial channel includes a central channel 233 for passing through the pulling mechanism 6 and a fluid channel 234 connected to the central channel 233. The fluid acts on the large diameter section 211 through the fluid channel 234 to push the starting sleeve 22 downward.

[0032] Further, if Figure 1 As shown, the lifting mechanism 6 may include an inner locking rod 61 and an inner pull rod 62 coaxially connected, the inner pull rod 62 is used to be connected to the coring tube of the coring tool, the inner locking rod 61 and the inner pull rod 62 can be threadedly connected, and in the initial state, the connection area between the inner locking rod 61 and the inner pull rod 62 and the small diameter section 212 of the starting sleeve 22 can be sealed through the fourth sealing ring 92.

[0033] In addition, if Figure 1 As shown, a first sealing ring 93 located between the positioning mechanism 4 and the external locking mechanism 3 and a second sealing ring 94 located at the bottom end of the starting sleeve 22 can be provided between the starting sleeve 22 and the alarm connector 21, and the external locking mechanism 3 is located between the first sealing ring 93 and the second sealing ring 94.

[0034] The working process of the rope coring tool in-position alarm and longitudinal locking device 100 according to an embodiment of the present invention is described in detail below:

[0035] The bottom hole assembly longitudinal locking mechanism 1 arrives at the coring position in advance along with the drill string before the coring tool is lowered. The seat ring 13 and the outer tube 12 are sealed by the third sealing ring 91 to prevent the drilling fluid from flowing to the bottom of the hole through the gap between the seat ring 13 and the outer tube 12.

[0036] The inner pull rod 62 of the pulling mechanism 6 is connected to the coring tube of the coring tool, and needs to remain stationary with the pressure-maintaining cylinder of the coring tool during the lowering process of the coring tool. However, after the coring is completed, the coring tube is lifted up a certain distance by the internal pulling mechanism of the upper coring tool to realize the linkage of the lower mechanism. Therefore, it is necessary to lock it in advance with the pressure-maintaining cylinder through the internal locking mechanism 5.

[0037] When the rope coring tool is in place alarm and the longitudinal locking device 100 is in the initial state, the starting sleeve 22 is in the top dead center position and contacts the locking joint 23. At this time, the positioning ball 42 is in the positioning groove 24 on the starting sleeve 22 under the elastic force of the disc spring 41, and the outer locking block 32 is in the outer locking groove 25 of the starting sleeve 22. The inner locking block 52 is in the inner locking groove 63 due to the obstruction of the starting sleeve 22, which plays the role of locking the pressure maintaining cylinder and the lifting mechanism 6, ensuring that the coring tube will not be unlocked prematurely during the lowering process of the coring tool.

[0038] Due to the sealing effect of the fourth sealing ring 92, the interior of the starting sleeve 22 is sealed from the lifting mechanism 6, and due to the sealing effect of the first sealing ring 93 and the second sealing ring 94 at both ends of the outer locking block 32, the exterior of the starting sleeve 22 is sealed from the alarm connector 21. When a coring tool is lowered into place, that is, the second step 27 of the alarm connector 21 contacts the seat ring 13, due to the metal wire seal, the drilling fluid can only enter the interior of the coring tool through the fluid channel 234 inside the locking connector 23 (preferably three evenly distributed dovetail water channels). However, due to the internal and external seals of the starting sleeve 22, the passage of the drilling fluid is blocked, causing the ground pump pressure to increase, prompting the ground operator that the coring tool is in place. The size of the pump pressure depends on the number of positioning balls 42, disc springs 41, and positioning ball sleeves installed on the alarm connector 21, and the elastic force of the disc spring 41, which can be adjusted according to on-site needs to achieve the purpose of adjustable alarm pressure.

[0039] When the pump pressure rises to a certain value, the starting sleeve 22 moves downward under the action of the upper and lower pressure differences, overcoming the force that causes the positioning ball 42 to escape from the positioning groove 24. At this time, the outer locking block 32, due to the reserved space inside the seat ring 13 (i.e., the engaging groove 131), moves out of the outer locking groove 25 under the push of the starting sleeve 22, automatically enters the reserved space of the seat ring 13, and under the action of the first shaft 31, does not separate from the alarm connector 21 and fall out of the coring tool. As the starting sleeve 22 moves downward, the inner locking block 52 can separate from the inner locking groove 63 and enter the space vacated by the starting sleeve 22, thereby unlocking the pressure-maintaining cylinder and the lifting mechanism 6. When the bottom end of the large-diameter section 211 of the starting sleeve 22 reaches the second step 27 of the alarm connector 21, i.e., the bottom dead center position, the tool in place alarm is completed, and the external locking and internal unlocking of the coring tool are completed.

[0040] When the coring tool is lifted, the lifting mechanism moves upward, and the mechanism connected to the lower end of the inner pull rod 62 moves upward together with the starting sleeve 22 because its outer diameter is larger than that of the starting sleeve 22. At this time, since the lifting distance of the inner pull rod 62 is greater than the upward distance of the starting sleeve 22, the inner locking block 52 first reaches the small diameter position of the inner pull rod 62, so that the inner locking block 52 can move inward, leaving space for the starting sleeve 22 to move up to the top dead point. When the starting sleeve 22 reaches the top dead point position, the outer locking block 32 can be retracted into the outer locking groove 25, realizing the external unlocking of the coring tool and ensuring that the coring tube is lifted a certain distance, the lower mechanism linkage of the tool can be completed.

[0041] During the recovery process of the coring tool, you can match the mark on the inner locking rod 61, first install the locking screw through the recovery hole 26, push the inner locking block 52 into the inner locking groove 63, and lock the pressure maintaining cylinder and the pulling mechanism 6, then push the starting sleeve 22 in from the lower end, first let the upper end of the starting sleeve 22 enter the gap between the locking joint 23 and the alarm joint 21, then remove the locking screw, and push the starting sleeve 22 to the top dead center to complete the rope coring tool in place alarm and the recovery of the longitudinal locking device 100.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A rope coring tool in-position alarm and longitudinal locking device, characterized in that: include: Bottom hole assembly longitudinal locking mechanism with central flow channel, An in-place alarm mechanism capable of being stuck in the central flow channel, the in-place alarm mechanism comprising an alarm joint for being stuck in the central flow channel and a start sleeve sleeved in the alarm joint, the alarm joint and the start sleeve being connected via a positioning mechanism, and a locking joint fixedly connected to the top end of the alarm joint and axially connected to the start sleeve. A lifting mechanism axially passes through the locking joint and the starting sleeve, wherein the lifting mechanism is sealed with the starting sleeve. an external locking mechanism for locking the alarm connector to the central flow channel, and An inner locking mechanism for locking the lifting mechanism on the locking joint, In which, the rope coring tool in-position alarm and longitudinal locking device is constructed to have an initial state and a working state. In the initial state, the alarm connector is stuck in the central flow channel, the outer locking mechanism is unlocked, the inner locking mechanism is locked, and the positioning mechanism is locked; in the working state, the fluid passes through the locking connector and pushes the starting sleeve downward, so that the positioning mechanism is unlocked, and the starting sleeve slides down relative to the alarm connector until the outer locking mechanism is locked on the central flow channel to realize the in-position alarm, and at the same time the inner locking mechanism is unlocked to realize the lifting of the pulling mechanism relative to the starting sleeve.

2. The rope coring tool in-position alarm and longitudinal locking device according to claim 1, characterized in that: The bottom drill assembly longitudinal locking mechanism includes a drill string joint and an outer cylinder coaxially connected, and a seat ring. An inner ring groove is formed between the drill string joint and the outer cylinder. The seat ring is seal-embedded in the inner ring groove. The inner diameter of the seat ring on the side close to the drill string joint is smaller than the inner diameter of the drill string joint. A limiting step for abutting against the side of the seat ring close to the drill string joint is formed on the outer peripheral wall of the alarm joint.

3. The rope coring tool in-position alarm and longitudinal locking device according to claim 2, characterized in that: An outer locking groove is formed on the outer peripheral wall of the starting sleeve, and a clamping groove is formed on the inner peripheral wall of the seat ring on the side away from the drill string joint. The outer locking mechanism includes a through groove formed on the alarm joint and an outer locking block connected to the through groove through a first shaft. A first axial through hole for passing the first shaft is formed in the outer locking block, and the aperture of the first axial through hole is larger than the diameter of the first shaft, so that in the initial state, the outer locking block is located in the outer locking groove but not in the clamping groove. In the working state, the outer locking block escapes from the outer locking groove and enters the clamping groove.

4. The rope coring tool in-position alarm and longitudinal locking device according to claim 3, characterized in that: The positioning mechanism includes a positioning groove formed on the outer peripheral wall of the starting sleeve, a receiving groove formed on the inner peripheral wall of the alarm connector, a disc spring located in the receiving groove, and a positioning ball located between the disc spring and the positioning groove. In the initial state, the positioning ball is elastically supported in the positioning groove by the disc spring. In the working state, the disc spring is compressed to allow the positioning ball to escape from the positioning groove.

5. The rope coring tool in-position alarm and longitudinal locking device according to claim 4, characterized in that: A connecting section for connecting the top of the alarm connector and a first step for abutting the top of the starting sleeve are formed on the outer peripheral wall of the locking joint. The first step is formed at one end of the connecting section close to the starting sleeve. A second step is formed on the inner peripheral wall of the alarm connector. The starting sleeve includes an axially connected large diameter section and a small diameter section. The top of the large diameter section abuts the first step, and a travel spacing is formed between the bottom end of the large diameter section and the second step. The positioning groove and the outer locking groove are sequentially spaced apart and formed on the small diameter section.

6. The rope coring tool in-position alarm and longitudinal locking device according to claim 5, characterized in that: The inner locking mechanism includes an inner locking groove formed on the outer peripheral wall of the lifting mechanism, an inner locking block connected to the locking joint through a second shaft, a second axial through hole for passing the second shaft is formed in the inner locking block, and the aperture of the second axial through hole is larger than the diameter of the second shaft. In the initial state, the inner locking block is located between the inner peripheral wall of the large diameter section and the inner locking groove. In the working state, the inner locking block is out of the inner locking groove and is located between the alarm joint and the lifting mechanism.

7. The rope coring tool in-position alarm and longitudinal locking device according to claim 6, characterized in that: In the initial state, a recovery hole is formed on the alarm connector at a position opposite to the inner locking groove.

8. The rope coring tool in-position alarm and longitudinal locking device according to claim 5, characterized in that: An axial channel is also formed on the locking joint, and the axial channel includes a central channel for passing through the lifting mechanism and a fluid channel connected to the central channel. The fluid acts in the large diameter section through the fluid channel to push the starting sleeve downward.

9. The rope coring tool in-position alarm and longitudinal locking device according to claim 5, characterized in that: The lifting mechanism includes an inner locking rod and an inner pulling rod coaxially connected, and the inner pulling rod is used to be connected to the coring tube of the coring tool. In the initial state, the connection area between the inner locking rod and the inner pulling rod is sealed with the small diameter section of the starting sleeve.

10. The rope coring tool in-position alarm and longitudinal locking device according to claim 5, characterized in that: A first sealing ring located between the positioning mechanism and the external locking mechanism and a second sealing ring located at the bottom end of the starting sleeve are provided between the starting sleeve and the alarm connector, and the external locking mechanism is located between the first sealing ring and the second sealing ring.

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